Answer:
[tex]\large\boxed{C.\ g(x)=3x^2}[/tex]
Step-by-step explanation:
[tex]f(x)=x^2\to f(1)=1^2=1\\\\g(1)=3\to\text{given point (1,\ 3)}\\\\3=3\cdot1=3\cdot1^2=3f(1)\to g(x)=3f(x)=3x^2[/tex]
